Rod-packing



(No Model.)

ROD PACKING. I

Patented Nov. 2, 1886..

WITNESSES:

INVENTOR ATTORNEY jmmq UNITED STATES PATENT OFFICE;

HENRY BUSHNELL, OF NEW HAVEN, CONNECTICUT.

i ROD-PACKING.

SPECIFICATION forming part of Letters Patent No. 351,828, dated November 2, 1886.

Application filed April 6, 1886.

To all whom it may concern:

Be it known that I,'HENRY BUSHNELL, a

resident of New Haven, in the State of Connecticut, have invented a new and useful Improvement in Rod-Packing, of which the foland claimed.

In thea'ccompanying drawings, Figure l is a sectional view of a throttle-valvefitted with my improved self-adjusting packing device, and Fig. 2. is a perspective'view of one of the flexible packing-collars.

Referring to the drawings, h designates the stuffing-box or hollow neck of the valve, centrally through which the valve-spindle k'is arranged. The lowerend of the valve-spindle is received in a step at the bottom of the stuffingbox cavity, and is formed conical, as. shown. The conical end fits a corresponding seat, k, at the bottom of the valve-step. The valve-port Z opens into the center of the valve-seat k and communicates, when the valve-spindle is raised, with a corresponding outlet, Z, adjacent to the valve-seat. A pair of cupped collars, 1), formed of leather or other suitable flexible material, are inserted in the stufiing-box cavity face to facearound the valve-spindle. The exterior rim or flange of each collar bears against the walls of the stnffing-box,whilethe interior rims or flanges of the same encircle the valve-spindle. The cavity or space be- Serial No. 198,0l6. (NolniodeL) I tween the cups isfilled with a thick and yielding composition or substance of such consistency that it cannot readily be forced through a small aperture or passage. A superior composition for this purpose may be made of melted beeswax, rosin, and tallow. The pack-j is raised or lowered by being turned therein.

In operation,when the pressure of an elastic fluid is exerted upon the lower side of the packing-collars the flanges or rims of the cups are pressed firmly against the walls of the stuffing-box and around the valve -'spindle, thereby forming a tight j oint,which effectually prevents the escape of the fluid. Several pairs of cupped collars with interposed filling may be used in one valve, when required. It will be seen that the stuffing-box is not kept tight by the pressure of the gland or bushing 71/, as in the case of ordinary stuffing-boxes; but the packing is always tight whenever'there is an elastic medium beneath it, and is therefore a self-adjusting and efficient packing.

I claim as new and desire to secure by Letters Patent The combination, with a valve-stem, of a pair of cupped collars, of leather or other flexible materiaLarraugeQface to face within the stuffing-box cavity around the valve-stem and filled with a thick and yielding composition or substance, all arranged substantially in the manner and for the purpose described.

HENRY BUSHNELL. Witnesses:

GEORGE L. BARNES, WM. J. Roor. 

